In order to assist class action defense attorneys anticipate the type of cases against which they will have to defend, we provide weekly, unofficial summaries of the legal categories for new class action lawsuits filed in California state and federal courts in the Los Angeles, San Francisco, San Jose, Sacramento, San Diego, San Mateo, Oakland/Alameda and Orange County areas. We include only those categories that include 10% or more of the class action filings during the preceding week. This report covers the time period of December 14 – December 20, 2007, during which time 37 new class action lawsuits were filed. Labor law class action cases generally top this list, and this proved to be true again. Sixteen (16) employment-related class action lawsuits were filed during this time period, representing 43% of the total number of new class action filings. Class actions alleging violations of federal antitrust laws came in second with 10 new filings (27%). The only other category of class actions to crack the 10% threshold alleged violations of California’s unfair competition law (UCL), which include false advertising claims, with 4 new class action filings (11%).